A mounting unit is provided that improves compatibility to be applied to various parts of a vehicle body which is coupled with a chassis by manufacturing the mounting unit to include a bracket and hardware. The mounting unit includes a bracket that has a first panel and a second panel, which are respectively bent several times, are combined with each other to form an empty portion to be surrounded by the first panel and the second panel and fixed to a vehicle body. Additionally, the mounting unit includes a hardware that is disposed in the empty portion to be fixed by being combined with the first panel and the second panel and adapted to form a thread for engaging a fastening mechanism.